package com.itheima;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
 @WebServlet("/servletDemo")
public class ServletDemo extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1通过响应对象写出提示信息
        //记录当前访问时间
        resp.setContentType("text/html;charset=UTF-8");
        PrintWriter pw = resp.getWriter();
        pw.write("欢迎使用本网站，你的最后访问时间为：<br/>");
        //2创建Cookie对象，用于记录最后访问时间
        Cookie cookie=new Cookie("time",System.currentTimeMillis()+"");
        //3设置最大存活时间
            cookie.setMaxAge(3600);
        //4将cookie对象添加到客户端
            resp.addCookie(cookie);
        //5获取cookie
        Cookie[] arr = req.getCookies();
        for (Cookie c : arr) {
            if("time".equals(c.getName())){
                //6获取cookie对象中的value 进行写出
                String value = c.getValue();
                SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                pw.write(sdf.format(new Date(Long.parseLong(value))));
            }
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}
